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Significant Accounting Policies - Schedule of impact of Topic 606 adoption on Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Statement of Operations data: |  |
Revenues | $ 885,288 | $ 855,933
Costs and Expenses: |  |
Direct costs | 865,446 | 853,232
Income tax expense | (2,532) | 27,094
Net loss | 171,545 | $ (120,353)
Balances Without Adoption of ASC 606 |  |
Statement of Operations data: |  |
Revenues | 878,655 |
Costs and Expenses: |  |
Direct costs | 868,561 |
Income tax expense | (2,502) |
Net loss | 161,827 |
Effect of Change Higher/(Lower) | ASU 2014-09 |  |
Statement of Operations data: |  |
Revenues | 6,633 |
Costs and Expenses: |  |
Direct costs | (3,115) |
Income tax expense | 30 |
Net loss | $ 9,718 |

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